FR2625433A1 - Femoral prosthesis for hip surgery - Google Patents
Femoral prosthesis for hip surgery Download PDFInfo
- Publication number
- FR2625433A1 FR2625433A1 FR8800332A FR8800332A FR2625433A1 FR 2625433 A1 FR2625433 A1 FR 2625433A1 FR 8800332 A FR8800332 A FR 8800332A FR 8800332 A FR8800332 A FR 8800332A FR 2625433 A1 FR2625433 A1 FR 2625433A1
- Authority
- FR
- France
- Prior art keywords
- prosthesis
- rod
- hip prosthesis
- hip
- femur
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30728—Collars; Bone edge protectors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3662—Femoral shafts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30112—Rounded shapes, e.g. with rounded corners
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30138—Convex polygonal shapes
- A61F2002/30153—Convex polygonal shapes rectangular
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/3011—Cross-sections or two-dimensional shapes
- A61F2002/30182—Other shapes
- A61F2002/30187—D-shaped or half-disc-shaped
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
- A61F2002/30233—Stepped cylinders, i.e. having discrete diameter changes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
- A61F2002/30336—Stepped cones, i.e. having discrete diameter changes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
- A61F2002/30357—Stepped cylinders, i.e. having discrete diameter changes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
- A61F2002/30614—Sets comprising both primary and revision endoprostheses
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- A—HUMAN NECESSITIES
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- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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- A—HUMAN NECESSITIES
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/32—Joints for the hip
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
Abstract
Description
La présente invention est relative à une prothèse fémorale d'un type nouveau , du genre de celles qu'on utilise pour la chirurgie de la hanche
On sait que la partie fémorale d'une prothèse de la hanche comprend , habituellement , une sphère d'articulation , reliée par un col , à la partie supérieure d'une tige que le chirurgien vient implanter longitudinalement , dans la partie supérieure de la cavité médullaire du fémur . L'ensemble est couramment réalisé en acier inoxydable . La sphère d'articulation peut être réalisée d'une pièce avec le col et la tige de la prothèse , ou bien au contraire , être rapportée sur un moignon prévu à l'extrémité du col , pour permettre un réglage adaptant la prothèse à l'anatomie du patient.The present invention relates to a femoral prosthesis of a new type, of the kind used for hip surgery.
We know that the femoral part of a hip prosthesis usually includes an articulation sphere, connected by a neck, to the upper part of a rod which the surgeon comes to implant longitudinally, in the upper part of the cavity. medullary of the femur. The assembly is commonly made of stainless steel. The articulation sphere can be made in one piece with the neck and the stem of the prosthesis, or on the contrary, be attached to a stump provided at the end of the neck, to allow an adjustment adapting the prosthesis to the patient anatomy.
Dans tous les cas , la tige de la prothèse est enfoncée dans la cavité médullaire longitudinale du fémur , avec ou sans utilisation d'un ciment de scellement
De nombreuses variantes sont connues qui concernent la forme et la structure de la tige de la prothèse , ainsi que son mode de fixation dans l'os
En pratique , on constate que la plupart des prothèses connues présentent à l'usage divers in
convénients
Tout d'abord , l'immobili$ation en rotation sur elle-même de la tige de prothèse dans le fémur s'avère souvent imparfaite .La prothèse finit par être ébranlée dans le fémur , à force d'être soumise à des contraintes en rotation , du genre de celles qui apparaissent lorsque le patient , à partir de la position assise , fait l'effort de se relever
Un autre inconvénient de la plupart des prothèses connues , concerne la difficulté que le praticien rencontre pour les extraire , en vue de les remplacer par de nouvelles prothèses .Souvent , l'extraction de l'ancienne prothèse et son remplacement par une prothèse de reprise ,s'effectuent en endommageant sérieusement le fémur
La présente invention a pour but d'éviter ces inconvénients , en réalisant une prothèse fémorale de hanche , susceptible d'être immobiliséeefficacement et de façon durable dans le fémur , alors que , par ailleurs, l'opération est facilitée , qui consiste à l'extraire pour le remplacer par une prothèse de reprise
Une prothèse fémorale de hanche selon l'invention comprend une sphère d'articulation reliée par un col oblique au sommet d'une tige prévue pour être enfoncée dans la cavité médullaire du fémur , et elle est caractérisée en ce que la section transversale de la tige possède un contour dissymétrique , ne définissant aucun angle aigu sur la face externe
Suivant une autre caractéristique de l'invention , la section transversale de la tige définit un contour fermé , approximativement rectangulaire dont le premier petit côté ( face externe de la prothèse) est rectiligne , alors que le second petit côté ( face interne de la prothèse ) , est prolongé par un arc curviligne , qui le surmonte.In all cases, the prosthesis stem is pressed into the longitudinal medullary cavity of the femur, with or without the use of a cement
Many variants are known which relate to the shape and structure of the prosthesis stem, as well as its method of fixation in the bone.
In practice, it is found that most of the known prostheses have various uses in
conveniences
First, the immobilization in rotation on itself of the prosthesis stem in the femur often turns out to be imperfect. The prosthesis ends up being shaken in the femur, by dint of being subjected to stresses in rotation, of the kind that appear when the patient, from the sitting position, makes the effort to get up
Another disadvantage of most of the known prostheses relates to the difficulty that the practitioner encounters in extracting them, with a view to replacing them with new prostheses. Often, the extraction of the old prosthesis and its replacement by a resumption prosthesis, are done by seriously damaging the femur
The present invention aims to avoid these drawbacks, by producing a hip femoral prosthesis, capable of being immobilized effectively and durably in the femur, while, moreover, the operation is facilitated, which consists in extract to replace it with a prosthesis
A femoral hip prosthesis according to the invention comprises a joint sphere connected by an oblique neck to the top of a rod intended to be inserted into the medullary cavity of the femur, and it is characterized in that the cross section of the rod has an asymmetrical contour, defining no acute angle on the external face
According to another characteristic of the invention, the cross section of the rod defines a closed, approximately rectangular contour, the first short side (external face of the prosthesis) is straight, while the second short side (internal face of the prosthesis) , is extended by a curvilinear arch, which surmounts it.
Suivant une autre caractéristique de l'invention , chacun des deux grands côtés du contour rectangulaire à extrémité curviligne , possède un décrochement rentrant , qui définit sur la tige de la prothèse, une rainure longitudinale
Suivant une autre variante de 1 'in- vention , les deux rainures longitudinales sont disposées en face l'une de l'autre , sur les parois latérales opposées de la tige de prothèse.According to another characteristic of the invention, each of the two long sides of the rectangular contour with curvilinear end, has a re-entrant recess, which defines a longitudinal groove on the stem of the prosthesis
According to another variant of the invention, the two longitudinal grooves are arranged opposite one another, on the opposite side walls of the prosthesis stem.
Le dessin annexé , donné à titre d'exemple non limitatif , permettra de mieux comprendre les caractéristiques de 1 'invention,et les avantages qu' elle est susceptible de procurer. The appended drawing, given by way of nonlimiting example, will make it possible to better understand the characteristics of the invention, and the advantages which it is capable of providing.
Figure 1 montre une prothèse selon l'invention , implantée dans la hanche droite d'un patient
Figure 2 montre , à grande échelle un détail de la figure 1
Figure 3 est une vue en perspective avec coupe partielle , d'une prothèse fémorale se l'on l'invention , prévue pour une première pose.Figure 1 shows a prosthesis according to the invention, implanted in the right hip of a patient
Figure 2 shows, on a large scale a detail of Figure 1
Figure 3 is a perspective view with partial section, of a femoral prosthesis according to the invention, provided for a first installation.
Figure 4 est une vue analogue pour une prothèse de reprise. Figure 4 is a similar view for a recovery prosthesis.
La prothèse représentée sur les figures l à 3 comprend une sphère d'articulation 1 , portée par un col rigide 2 qui prolonge , à sa partie supérieure , une tige 3 . Cette dernière est prévue pour être enfoncée longitudinalement ( figure 2 , flèche 4) , dans la cavité médullaire 5 d'un fémur 6. The prosthesis shown in FIGS. 1 to 3 comprises a hinge sphere 1, carried by a rigid neck 2 which extends, at its upper part, a rod 3. The latter is intended to be inserted longitudinally (FIG. 2, arrow 4), into the medullary cavity 5 of a femur 6.
La sphère 1 s'adapte généralement de fanon amovible sur un moignon 7 , qui prolonge le col 2
Cette dispositiion permet au chirurgien de choisir , parmi plusieurs sphères 1 dimensionnées différemment , celle qui convient le mieux à l'anatomie du patient.The sphere 1 generally fits a removable baleen on a stump 7, which extends the neck 2
This arrangement allows the surgeon to choose, among several spheres 1 dimensioned differently, that which best suits the patient's anatomy.
La sphère peut être de petit diamètre ( 28 ou 32 millimètres) ,pour s'articuler avec une prothèse fixée sur le bassin , réalisant ainsi ce que l'on appelle une prothèse totale de hanche . La sphère peut être également une bille , choisie parmi plusieurs dont les diamètres s'échelonnent , de deux millimètres en deux millimètres ,de 38 à 60 millimètres ,pour s'articuler directement sur le cartilage du bassin , réalisant ainsi une prothèse fémorale simple de hanche. The sphere can be of small diameter (28 or 32 millimeters), to articulate with a prosthesis fixed on the pelvis, thus achieving what is called a total hip prosthesis. The sphere can also be a ball, chosen from several whose diameters range from two millimeters to two millimeters, from 38 to 60 millimeters, to articulate directly on the cartilage of the pelvis, thus achieving a simple femoral hip prosthesis .
Après son introduction à force dans la cavité médullaire 5 ( figure 2 , flèche 4) , la prothèse est immobilisée par la mise en place d'un ciment de scellement 8. After its forced introduction into the medullary cavity 5 (FIG. 2, arrow 4), the prosthesis is immobilized by the placement of a sealing cement 8.
La base du col 2 se raccorde à la partie supérieure de la tige 3 , par un bras incurvé 9 que surmonte une collerette transversale 10 , prévue pour prendre appui sur le sommet du fémur 6. The base of the neck 2 is connected to the upper part of the rod 3, by a curved arm 9 surmounted by a transverse flange 10, intended to bear on the top of the femur 6.
Selon l'invention , la tige 3 a pour section transversale , un contour 11 dont la forme générale est sensiblement rectangulaire . En particulier
- le premier petit côté 12 est rectiligne
- le second petit côté 13 qui est lui est théoriquement
opposé se trouve surmonté par un arc courbe 14 qui
prolonge le rectangle par la face interne de la pro
thèse
- chacun des deux grands côtés 15 et 16 est creusé par
un décrochement , respectivement 17 et 18 , si bien
que , sur la tige 3 , se trouvent creusées ,
une en face de l'autre , deux rainures lnngitu-
dinales 19
La prothèse 2 , 9 , 3 , illustrée sur les fitures 2 et 3 , est une prothèse de première pose.According to the invention, the rod 3 has for cross section, a contour 11 whose general shape is substantially rectangular. In particular
- the first short side 12 is straight
- the second small side 13 which is it is theoretically
opposite is topped by a curved arc 14 which
extend the rectangle by the internal face of the pro
thesis
- each of the two long sides 15 and 16 is hollowed out by
a recess, respectively 17 and 18, so well
that, on the rod 3, are hollowed out,
one opposite the other, two grooves lnngitu-
dinals 19
The prosthesis 2, 9, 3, illustrated on the shapes 2 and 3, is a prosthesis of the first fitting.
Au contraire , on a illustré sur la figure 4 , une prothèse de reprise où , cette fois , le bras courbe de raccordement 9 est surmonté , dans sa partie externe , par une face transversale plane 20 , sensiblement perpendiculaire à l'axe longitudinal de la tige 3. On the contrary, there is illustrated in FIG. 4, a recovery prosthesis where, this time, the curved connection arm 9 is surmounted, in its external part, by a plane transverse face 20, substantially perpendicular to the longitudinal axis of the rod 3.
Cette face transversale 20 facilite le travail du chirurgien , qui la frappe au marteau , pour enfoncer la tige 3.This transverse face 20 facilitates the work of the surgeon, who strikes it with a hammer, to drive in the rod 3.
Dans le cas de la prothèse de reprise 2 , 20 , 9 , 3 , la section transversale de la tige 3 conserve la forme du contour 11 précédemment décrit. In the case of the recovery prosthesis 2, 20, 9, 3, the cross section of the rod 3 retains the shape of the contour 11 previously described.
On voit que , dans tous les cas la prothèse selon l'invention possède , sur sa face externe , un méplat longitudinal 21 . Ainsi , sur toute la face externe de la tige 3 , ne se trouve aucun angle aigu .On a constaté que cette disposition est essentielle , pour que après implantation dans le fémur , la prothèse ne soit soumise , en rotation , qu'a des contraintes d'intensité limitée . En particulier , cela évite le descellement de la prothèse quand le patient la soumet à de telles contraintes en rotation : tel est le cas , notamment , si le patient assis se lève. It can be seen that, in all cases, the prosthesis according to the invention has, on its external face, a longitudinal flat 21. Thus, on the entire external face of the rod 3, there is no acute angle. We have found that this arrangement is essential, so that after implantation in the femur, the prosthesis is subjected, in rotation, only to constraints of limited intensity. In particular, this avoids loosening of the prosthesis when the patient subjects it to such rotational stresses: this is the case, in particular, if the seated patient stands up.
La face interne de la prothèse ou second petit côté 13 , se trouve surmonté par un axe courbe 14 , destiné à mieux transmettre les contraintes de compression au moule de ciment , et éviter le descellement. The internal face of the prosthesis or second short side 13 is surmounted by a curved axis 14, intended to better transmit the compression stresses to the cement mold, and to avoid loosening.
Par ailleurs , les rainures longitudinales 19 facilitent l'encastrement- de la tige 3 dans le moule de ciment , te renforcent l'interface prothèse/ ciment , sans compromettre pour autant les possibilités d'extraction de la prothèse si ,pour une raison ou pour une autre ,son remplacement par une prothèse de reprise devient nécessaire. Furthermore, the longitudinal grooves 19 facilitate the embedding of the rod 3 in the cement mold, reinforce the prosthesis / cement interface, without compromising the possibilities of extraction of the prosthesis if, for a reason or for another, its replacement by a prosthesis becomes necessary.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8800332A FR2625433B1 (en) | 1988-01-06 | 1988-01-06 | FEMALE PROSTHESIS, FOR HIP SURGERY |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8800332A FR2625433B1 (en) | 1988-01-06 | 1988-01-06 | FEMALE PROSTHESIS, FOR HIP SURGERY |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2625433A1 true FR2625433A1 (en) | 1989-07-07 |
FR2625433B1 FR2625433B1 (en) | 1998-11-06 |
Family
ID=9362272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8800332A Expired - Fee Related FR2625433B1 (en) | 1988-01-06 | 1988-01-06 | FEMALE PROSTHESIS, FOR HIP SURGERY |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2625433B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0974317A1 (en) * | 1998-07-24 | 2000-01-26 | BEJUI, Jacques | Anchoring shaft for hip joint prosthesis and set of such shafts |
EP1205164A1 (en) * | 2000-11-07 | 2002-05-15 | Biomet Merck France | Hip prosthesis |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2344272A1 (en) * | 1976-03-20 | 1977-10-14 | Baumann Friedrich | HIP JOINT PROSTHESIS |
DE2627569A1 (en) * | 1976-06-19 | 1977-12-22 | Friedrichsfeld Gmbh | Prosthesis for head of femur - has ridge at shoulder and groove reaching to lower end |
US4068324A (en) * | 1977-01-19 | 1978-01-17 | Bio-Dynamics Inc. | Platform supported hip prosthesis |
DE8213101U1 (en) * | 1982-08-26 | Howmedica International, Inc. Zweigniederlassung Kiel, 2300 Kiel | Femoral component of a hip joint prosthesis |
-
1988
- 1988-01-06 FR FR8800332A patent/FR2625433B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8213101U1 (en) * | 1982-08-26 | Howmedica International, Inc. Zweigniederlassung Kiel, 2300 Kiel | Femoral component of a hip joint prosthesis | |
FR2344272A1 (en) * | 1976-03-20 | 1977-10-14 | Baumann Friedrich | HIP JOINT PROSTHESIS |
DE2627569A1 (en) * | 1976-06-19 | 1977-12-22 | Friedrichsfeld Gmbh | Prosthesis for head of femur - has ridge at shoulder and groove reaching to lower end |
US4068324A (en) * | 1977-01-19 | 1978-01-17 | Bio-Dynamics Inc. | Platform supported hip prosthesis |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0974317A1 (en) * | 1998-07-24 | 2000-01-26 | BEJUI, Jacques | Anchoring shaft for hip joint prosthesis and set of such shafts |
FR2781365A1 (en) * | 1998-07-24 | 2000-01-28 | Jacques Bejui | ANCHORING ROD FOR HIP JOINT PROSTHESIS AND SET OF SUCH RODS |
EP1205164A1 (en) * | 2000-11-07 | 2002-05-15 | Biomet Merck France | Hip prosthesis |
FR2816827A1 (en) * | 2000-11-07 | 2002-05-24 | Biomet Merck France | HIP PROSTHESIS |
Also Published As
Publication number | Publication date |
---|---|
FR2625433B1 (en) | 1998-11-06 |
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